Reversed size-dependent stabilization of ordered nanophases

Autor: J. Pirart, A. Front, D. Rapetti, C. Andreazza-Vignolle, P. Andreazza, C. Mottet, R. Ferrando

Publikováno v: Nature Communications, Vol 10, Iss 1, Pp 1-7 (2019)

Increasing nanoparticle size usually increases the stability of ordered phases within them. In contrast, the authors show here that the L11 ordered phase only forms in AgPt nanoparticles smaller than 2.5 nm because the segregation of a monolayer Ag s

Externí odkaz: https://doaj.org/article/5fa9b065e0c040fbbe8fdc9185ff8507

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Ordering Frustration in Large-Scale Co–Pt Nanoalloys

Autor: Alexis Front, C. Mottet

Publikováno v: Journal of Physical Chemistry C
Journal of Physical Chemistry C, 2021, 125 (29), pp.16358-16365. ⟨10.1021/acs.jpcc.1c05701⟩
Journal of Physical Chemistry C, American Chemical Society, 2021, 125 (29), pp.16358-16365. ⟨10.1021/acs.jpcc.1c05701⟩

International audience; Large-scale nanoalloys of Co−Pt from 3 to 7 nm are modeled using realistic atomistic potentials and Monte Carlo simulations, sweeping the entire concentration range. They display a clear tendency to reproduce bulk-ordered ph

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::07210105236654cff97e0d225b99f678
https://hal.science/hal-03307140/document

Tight-binding Ising modeling of the interplay between bulk ordering and surface segregation in Pt-Ag nanoalloys

Autor: Guy Tréglia, Alexis Front, Fabienne Berthier, C. Mottet, Moncef Said, Abir Hizi

Publikováno v: Surface Science
Surface Science, Elsevier, 2020, 700, pp.121626. ⟨10.1016/j.susc.2020.121626⟩
Surface Science : A Journal Devoted to the Physics and Chemistry of Interfaces
Surface Science : A Journal Devoted to the Physics and Chemistry of Interfaces, 2020, 700, pp.121626. ⟨10.1016/j.susc.2020.121626⟩

International audience; We use a Tight-Binding Ising Model (TBIM) with effective pair interactions depending on concentration able to reproduce the bulk phase diagram of Pt-Ag system and in particular its strong asymmetry as a function of composition

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7a17b9058956bca98d9fac2cab0dd9f6
https://hal.archives-ouvertes.fr/hal-03333837

Reversed size-dependent stabilization of ordered nanophases

Autor: C. Mottet, C. Andreazza-Vignolle, Riccardo Ferrando, Pascal Andreazza, J. Pirart, A. Front, Daniele Rapetti

Publikováno v: Nature Communications, Vol 10, Iss 1, Pp 1-7 (2019)
Nature Communications
Nature Communications, Nature Publishing Group, 2019, 10 (1), ⟨10.1038/s41467-019-09841-3⟩
Nature Communications, 2019, 10 (1), ⟨10.1038/s41467-019-09841-3⟩

The size increase of a nanoscale material is commonly associated with the increased stability of its ordered phases. Here we give a counterexample to this trend by considering the formation of the defect-free L11 ordered phase in AgPt nanoparticles,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5fea4e859fb5408b34753065251ba267
https://doi.org/10.1038/s41467-019-09841-3